Improvement in slide-valves for steam-engines



H. ELLIOT..

Slide-Valves for` Steam-Engines.

Patented sept. 22,1874.

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UNITED STATES PATENT GEEIoE.

HENRY ELLIOT, OF EAST ST. LOUIS, ILLINOIS.

IMPROVEMENT IN SLIDE-VALVES FOR STEAM-ENGINES.

Specification forming part of Letters Patent No. 155,298, datedSeptember 22, 1874; application tiled June 30, 1874.

To all whom it may concern Be it known that I, HENRY ELLIOT, of East St.Louis, St. Clair county, Illinois, have invented certain Improvements inSlide-Valves for Steam-Engines, of which the following is aspecification:

This is an improvement on the valve described in my patent No. 130,492,dated Angust 13, 1872. The improvement consists in. forming channels orsteam-ports in the lower side of the bearing-bar, so as to allow thesteam to enter the cylinder-ports by that means. These channels arepreferably made in a direction oblique to the bar, as shown, so as towear no channels in the valve-seat.

Figure 1 is a longitudinal section. Figs. 2 and 3 are perspective views,showing` face views of the valve.

The valve Gr is made of the same general form as that shown in my formerpatent. The valve-seat is as usual, and the parts are designated by thesame letters as in my former patent aforesaid, in which A is a portionot' the steam-cylinder 5 B, valve-seat, having bearings b bf; C,induction steam-ports; D, exhaust-port; E, steam-chest; F, valve-stem;G, valve; H, bearing-bars; I, usual bearing-face ofthe valve. Theimprovement applies to the outer bearing, which is constructed in thesame general form as in my said former patent, having the same endproject-ion shown at h forming part of the bearing-bar H. K K, &c., area number of channels, steam-ports, or passages made in the lower sidesof the bars H to allow the steam to pass from the steam-chest to theport C when the valve is in the proper position. In Figs. l and 2 thechannels K form the sole means of communication between the valve-chestand the steamports, the channel L', into which the channels or passagesK open, not extending through the top of the valve; while in Fig. 3 isshown a modification, in which the vertical orifices or ports L areretained as in the former patent, and the channels or passages K made otsmaller section, a portion only of the steam passing through them.

lt is considered desirable that the steam should be permitted to come incontact with the under side of the bearing H to balance to some extentthe top pressure; also, that it is desirable that the steam should havemeans of freely entering the ports C when the valve has full throw, andwhen the bar H would partially cover the port; also, to more freelyadmit the lubricants between the faces of the valve and seat; and tomeet these requirements I have devised this improvement.

These ends would be met to some extent by making the passages Ktransverse to the bar H 5 but in that case the bearing-faces between thepassages would wear depressions in the faces b; and to avoid this I havemade the passages oblique to the line of motion, so that all parts ofthe bearing-faces b shall be equally worn, as will be readily understoodby reference to the drawing.

I claim as my invention- In combination with the bearings H,steampassages or channels K in the lower side ot' the same,substantially as and for the purpose set forth.

In testimony of said invention I have hereunto set my hand this 25th dayot' June, IS7-l.

HENRY ELLIOT.

NVitnesses:

SAML. KNIGHT, ROBERT BURNS.

